To sound with a quick, harsh noise; to make the sound of a tense string pulled and suddenly let go; as, the bowstring twanged.

To make to sound, as by pulling a tense string and letting it go suddenly.

A harsh, quick sound, like that made by a stretched string when pulled and suddenly let go; as, the twang of a bowstring.

a sharp vibrating sound (as of a plucked string)

cause to sound with a twang; "He twanged the guitar string"

sound with a twang; "the bowstring was twanging"

pluck (strings of an instrument); "He twanged his bow"

Twang can be used in many forms, not just a silly, cartoon word, but also as a word for describing certain sounds. Guitars are plucked and make a "twang". It can be used in describing anything to do with elastic bands - when stretched and released, they make quite a distinct twang.